1875, folded letter, franked with single of 1 Sk. green and vertical pair of 7 Sk. brown posthorn, from CHRISTIANIA 11/5 1875 to Pourrain at Auxerre (France), letter not complete, only front and back complete, otherwise in very good condition, transit PARIS and arrival on back, rare combination! (Katalog-Nr.: 16, 21 (2))